Question about Sony KDL55HX800 55 in. TV

2 Answers

My kdl-55hx800 will occaisonally power off and back on shortly after it is turned on, it also loses its clock setting when this happens. I have installed the latest software, 086, which was supposed to resolve this. any suggestions? thank you!

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  • panfili Apr 08, 2011

    this all makes sense,but the tv is 6 monthes old.

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  • Sony Master
  • 74,198 Answers

Hello
Check well whether there is any loose contacts in the wall supply outlet, or to any other extented wirings. Your TV loses supply voltage to it by anyway. If the supply votage is steady; clock settings will not reset, eventhough the internal circuits or the TV has some trouble. The loose contact may be in its power inverter board inside. It is very difficult to detect these loose contacts with naked eye, as they will be micrscopic, and can be noted with the help of a high power magnifying glass. In practice, what I do is, to this type of fault is to resolder most of the suspected solder points, by applying a little more solder, without making any solder bridge short in between the component terminals. If you have a concept of soldering, you too can do this work. But must have patience, and a steady hand. Look for any loose in outer supply wiring first. Try an other plug point too. Still fault prevails, be sure that the supply inverter board has the trouble and the loose contact is in it.
Just check these. if it does not helps you inform me by Fixya. I'm happy to assist you.
Me caucious when handling the main supply inverter board. Eventhough the power input is disconnected, ther may be some storage voltage be there in the high voltage capacitors in it. Discharge them before doing any soldering work on it. Try. Wish you Good Luck. OK.
Thanks for using Fixya.

Posted on Apr 08, 2011

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  • Master
  • 1,591 Answers

There's a good chance you have failing electrolytic capacitors either in the power section or the inverter section or both.
Any caps in these sections that look bulged at the top, or bulged/leaking at the bottom need to be replaced.
Each time you turn it on, eventually it'll probably stay on, but every time you turn it off, the TV will get harder and harder to start up until one day it just won't.
You may also notice a clicking when it power cycles when you first start it up.

If you aren't tech savvy, don't worry, read the rest of this post and watch the videos.

If you are handy with a soldering iron and can identify the power supply and inverter / FM section for the backlights, an inexpensive handful of capacitors will likely fix you right up.
Match the capacitance on the capacitors. Go over voltage if you can, and still have them fit.
IE - it's not a bad idea to replace a 10V cap with a 16V or 25V or even a 50V, but don't replace a 680uF cap with a 500uF or a 1000uF (unless you are positive it's only doing ripple filtering, and even then, you should go OVER, not under the uF rating).

Most of the caps that go are 10V 1000uF or 3300uF.

I found some great videos of the procedure (for many Samsungs with the same issue) on youtube.
http://www.youtube.com/watch?v=Mm51C_RDIZE
http://www.youtube.com/watch?v=BNHHrgX_6cs&feature=related
http://www.youtube.com/watch?v=8l0AUj8QUkg&NR=1&feature=fvwp
http://www.youtube.com/watch?v=Y7b_nTaZYcU&feature=related

As you can see, this issue spans plasma TVs, as well as large and small LCD TVs and monitors.
This problem is not brand or model specific, it's affecting many!
The parts are cheap, and skill required is minimal.

Posted on Apr 08, 2011

  • Norman Skinner
    Norman Skinner Apr 08, 2011

    These are improperly manufactured capacitors.
    They can fail at any time...most outlive the warranty (barely) others don't.
    If it's under warranty, get the manufacturer to repair it for free.

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